java去除字符串中的空格、回车、换行符、制表符

java去除字符串中的空格、回车、换行符、制表符
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtil {

public static void replaceBlank()
{
   Pattern p = Pattern.compile(“\\s*|\t|\r|\n”);
   String str="I am a, I am Hello ok, \n new line ffdsa!";
   System.out.println("before:"+str);
   Matcher m = p.matcher(str);
   String after = m.replaceAll("");
   System.out.println("after:"+after);
}

public static void main(String[] args) {
     replaceBlank();
   }

}